E2UNDO(8) System Manager's Manual E2UNDO(8)
NAME
e2undo - Replay an undo log for an ext2/ext3/ext4 file system
SYNOPSIS
e2undo [ -f ] [ -h ] [ -n ] [ -o offset ] [ -v ] [ -z undo_file ]
undo_log device
DESCRIPTION
e2undo will replay the undo log undo_log for an ext2/ext3/ext4 file
system found on device. This can be used to undo a failed operation by
an e2fsprogs program.
OPTIONS
-f Normally, e2undo will check the file system superblock to make
sure the undo log matches with the file system on the device.
If they do not match, e2undo will refuse to apply the undo log
as a safety mechanism. The -f option disables this safety mech-
anism.
-h Display a usage message.
-n Dry-run; do not actually write blocks back to the file system.
-o offset
Specify the file system's offset (in bytes) from the beginning
of the device or file.
-v Report which block we're currently replaying.
-z undo_file
Before overwriting a file system block, write the old contents
of the block to an undo file. This undo file can be used with
e2undo(8) to restore the old contents of the file system should
something go wrong. If the empty string is passed as the
undo_file argument, the undo file will be written to a file
named e2undo-device.e2undo in the directory specified via the
E2FSPROGS_UNDO_DIR environment variable.
WARNING: The undo file cannot be used to recover from a power or
system crash.
AUTHOR
e2undo was written by Aneesh Kumar K.V. (aneesh.ku-
mar@linux.vnet.ibm.com)
AVAILABILITY
e2undo is part of the e2fsprogs package and is available from
http://e2fsprogs.sourceforge.net.
SEE ALSO
mke2fs(8), tune2fs(8)
E2fsprogs version 1.46.5 December 2021 E2UNDO(8)
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